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adjective

crazy, irrational. Note: theorized that the term is a vague allusion to the "jack-in-the-box" toys, a box containing a head mounted on a spring that would pop open after a crank had been turned. The head would then bounce around. The unpredictable motion of the toy could be likened to someone who is "out of the box."

I don't know what her problem is, but she's completely out of the box!